Methods	Randomized feasibility study
Participants	897 women undergoing evaluation for fetal well-being.
Interventions	Doppler (umbilical artery resistance index) or FHR testing (computerised FHR monitoring and numerical analysis on-line)
Outcomes	Reasons for delivery, method of delivery, gestational age, birthweight, 5-minute Apgar score < 7, perinatal mortality, special care nursery
Notes
Risk of bias
Bias	Authors’ judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Computer-generated algorithm based on hospital number.
Allocation concealment (selection bias)	Unclear risk	Not described.
Blinding of participants and personnel (performance bias) All outcomes	High risk	Not blinded.
Blinding of outcome assessment (detection bias) All outcomes	High risk	Not blinded.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Appears to be no loss to follow-up according to data presented in table 2 and 3 - patient numbers add up to 438 for Doppler group and 459 for FHR group - so all patients accounted for from 897 initially referred
Selective reporting (reporting bias)	Unclear risk	Unclear - not clearly documented which outcomes were to be collected as part of the study
Other bias	Low risk	“The two groups were well-matched for the baseline variables measured.”